IEEE C802.16m-09/2274
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Unified Carrier Indication for AAI_NBR-ADV and AAI_MC-ADV Messages (15.2.3.11)
Date
Submitted
2009-11-06
Source(s)
I-Kang Fu, Kelvin Chou, Yih-Shen Chen,
Paul Cheng
MediaTek Inc.
Re:
P802.16m/D2
Abstract
Currently both the AAI_NBR-ADV and AAI_MC-ADV messages are requested to provide the
frequency and bandwidth information of each carrier. In order to prevent unnecessary overhead,
it is reasonable to allow AAI_MC-ADV provide global carrier information supported by system
operator and the corresponding physical carrier index, so that AAI_NBR-ADV only need to
broadcast the physical carrier indexes supported by each ABS. This can substantially reduce the
broadcast overhead.
Purpose
For TGm discussion and adoption into P802.16m/D2
Notice
Release
Patent
Policy
IK.Fu@mediatek.com
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for
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and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name
any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole
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contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
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<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
1
IEEE C802.16m-09/2274
Unified Carrier Indication for AAI_NBR-ADV and AAI_MC-ADV Messages
I-Kang Fu, Kelvin Chou, Yih-Shen Chen, Paul Cheng
MediaTek Inc.
1 Introduction
The IEEE 802.16m system will be most likely be deployed over multiple carriers, no matter so called “multicarrier” operation is enabled or not. In order to indicate the center frequency and bandwidth of each carrier
efficiently, the AAI_MC-ADV was adopted into P802.16m to utilize the physical carrier index to indicate the
center frequency and the bandwidth of each carrier.
On the other hand, AAI_NBR-ADV also needs to provide the same information to facilitate the scanning
operation by AMS. Compare with traditional method by separate parameters to indicate center frequency and
bandwidth, utilizing the existing physical carrier index can obviously save overhead by single parameter. Since
the number of ABS need to be indicated in AAI_NBR-ADV is large, the overhead reduction effect will be
significant by utilizing physical carrier index in AAI_NBR-ADV.
In order to allow physical carrier index be used in AAI_NBR-ADV message, the content of AAI_MC-ADV
message also need to be modified. The simplest way is to reuse the existing parameter definition but change the
information scope from serving ABS to entire network. This means, the multi-carrier configuration indicated in
AAI_MC-ADV message is all the carriers may be supported by the network. By letting AMS has this global
information, the carriers supported by each ABS can be simply indicated by physical carrier index.
Therefore, the general operation flow is that AMS will need to receive AAI_MC-ADV message to obtain the
global multi-carrier configuration once enter the network. Then it can further understand the carriers supported
by neighboring ABSs through AAI_NBR-ADV message. This can save the overhead from AAI_NBR-ADV,
which has been overloaded too much information inside.
2 Text Proposal
---------------------------------------------------------Start of the Text----------------------------------------------------------[Adopt the following text modification started from line#49, page#48 in P802.16m/D2]
15.2.3.11 AAI_NBR-ADV
…….
Each AAI_NBR-ADV message carries

AAI_NBR-ADV change count

number of total cell types

segment information for this AAI_NBR-ADV message

system information of ABSs from one or more cell types, which is of variable size.
For each cell type, shared configuration parameters are carried as follows

FA information
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IEEE C802.16m-09/2274



BW information
Duplex mode
MAC protocol version
For each fragment of the AAI_NBR-ADV, the fragment shall include the following parameters - Starting BS
Index (i.e. this is the index offset from the last BS of the previous fragment. If this is first fragment, the Starting
Index will be 0. Hence, each fragment has one Index which corresponds to the first BS in that fragment.)
Within each cell type, a list of ABSs are provided and the following parameters are carried for each ABS

Index of neighbor ABS in the whole neighbor list maintained by serving ABS

48bit BS-ID

ABS A-Preamble index

indication whether full system information or partial information is carried for this ABS, which includes
SFH information
ESI information
Index to MC configuration,
Physical carrier index (6 bits, refer to the “Multi-carrier configuration index” defined in AAI_MCADV)
Number of MAC protocol versions supported (4 bits)
list of supported MAC protocol versions (4 bits per entry)
where for ABS of macrocell type, all the necessary system information shall be included, and the format may
only carry delta information fields with respect to the reference ABS(e.g., the serving BS or the first BS/ABS in
this cell type); and for Wireless-MAN-OFDMA reference system, only 48-bit BS-ID and Preamble index are
included in AAI_NBR-ADV.
where for macrocell type, all the necessary system information shall be included, and the format may only carry
delta information fields with respect to the reference ABS(e.g., the serving BS or the first BS/ABS in this cell
type).

SFH_encoding_format: Based on the present system information, the list of ABSs shall be categorized into
three groups. The categorization is indicated by SFH_encoding_format parameter
- 0b00: Reserved
- 0b01: full Subpacket information
- 0b10: delta encoding with TBD Format
- 0b11: no SFH included
Table XXX—AAI_NBR-ADV message format
Syntax
Size
(bit)
Note
AAI_NBR-ADV_Message_format() {
—
—
Management Message Type = NN
8
—
Change Count
3
NBR-ADV change count
Number of cell types
3
Cell type in this message
3
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IEEE C802.16m-09/2274
TBD
Number of segments for
this cell type
Segment Index
TBD
Segment index of this
message in the specific cell
type
BS number M
TBD
Total number of BSs to be
included in this segment
Total Number of Segments
Multi-carrier configuration change count
4
Refer to the change count in
AAI_MC-ADV
for (i=0; i<M; i++)
{
Index of BS
8
BSID
48
The index of the BS in the
whole AAI_NBR-ADV
Number of carriers (NC)
for( j=0; j<NC; j++) {
A-PREAMBLE index
TBD
A-PREAMBLE transmit power
8
Physical carrier index
6
Number of MAC protocol versions supported: P
4
Refer to the change count in
AAI_MC-ADV
Greenfield: 1
Mixed-mode: >1
For (i=0; i<P; i++) {
MAC protocol version
4
Consistent with REV.2
definition, with new MAC
protocol version 9 defined
for 16m.
2
00: full Subpkt information
01: delta encoding with
TBD format (the 1st BS in
}
}
SFH_encoding_format
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IEEE C802.16m-09/2274
this cell type shall use full
Subpkt encoding )
Control_bitmap
4
If( SFH_encoding_format =00
Each bit maps to one SFH
subpacket or extended
broadcast information. For
macrocell ABS, the bitmap
shall be 1111.
//encoding format type-1
{
If( Control_bitmap[0] ==1 )
{
SFH Subpkt 1
TBD
//exclude
those
fields
already in cell type info
TBD
//exclude
those
fields
already in cell type info
TBD
//exclude
those
fields
already in cell type info
}
If( Control_bitmap[1] ==1 )
{
SFH Subpkt2
}
If( Control_bitmap[2] ==1 )
{
SFH Subpkt3
}
}
If( SFH_encoding_format =01
{
Delta information
Delta encoding, w.r.t. the
reference BS
}
}
}
5
—
—
—
—
IEEE C802.16m-09/2274
[Adopt the following text modification started from line#56, page#148 in P802.16m/D2]
15.2.8.2.3.1.1 AAI_MC-ADV (Multi-Carrier Advertisement) Message
Table 725 AAI_MC-ADV MAC Control Message Format
Field
Multi-carrier
count
Size
(bit)
configuration
change 4
MC configuration broadcast flag
1
Description
A change count associated with a particular
configuration for all possible carriers in the network.
Incremented by 1 upon each update.
0: only broadcast serving BS specific info
1: broadcast multi-carrier definition fro all available
carriers in the network.
If (MC configuration broadcast flag ==
1) {
Number of Carrier Groups
4
Groups of contiguous carriers
Uniformity Flag
1
0: All Carriers have the same Protocol Version, Carrier
Type Duplexing Mode and Transmit Power.
1: otherwise
Physical Carrier Index of Current 6
Carrier
The carrier that ABS broadcast this message
For (i=1; i<= Number of Carrier
Groups; i++){
Multi-Carrier Configuration Index
6
Index associated to Table 648
Start Frequency Assignment Index
6
Frequency Assignment Index of the first carrier in
carrier group #i
Number of Carriers
4
Number of carriers in carrier group #i
For (j=1; j <= Number of Carriers; j++)
{
Physical Carrier Index
6
Preamble Index
6
If (Uniformity Flag == 1) | | (i == 1
&& j == 1) ) {
Protocol Version
2
“00” IEEE 802.16-2009 only mode
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IEEE C802.16m-09/2274
“01” IEEE802.16m and IEEE 802.16-2009 mixed
mode
“10” IEEE 802.16m only mode
“11” Reserved
Carrier Type
“0” for fully configured
1
“1” for partially configured
Duplexing Mode
1
“0” for TDD
Transmit Power
6
“1” for FDD
Maximum A-Preamble transmit power level
}
Physical Carrier Index of Current 6
Carrier
The carrier that ABS broadcast this message
}
}
}
Serving BS Carrier Number
For (i=0; i<Serving
Number-1; i++){
BS
6
//start broadcasting serving BS specific info
Carrier
Physical Carrier Index
Number of MAC protocol versions
supported: P
6
4
Greenfield: 1
Mixed-mode: >1
For (i=0; i<P; i++)
{
MAC protocol version
4
Preamble Index
6
Consistent with REV.2 definition, with new MAC
protocol version 9 defined for 16m MAC version.
}
}
[Adopt the following text modification into line#3, page#284 in P802.16m/D2]
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IEEE C802.16m-09/2274
Table 764 Center frequency and bandwidth of each adjacent carriers within a carrier group (with sub-carrier
alignment)
Configuration Frequency Offset Δf (kHz)
Index
Multi-Carrier
(MHz)
1
{5}
{0}
2
{7}
{0}
3
{8.75}
{0}
4
{10}
{0}
5
{20}
{0}
6 TBD
{10, 10}
{0, -3.1248}
----------------------------------------------------------End of the Text-----------------------------------------------------------
8